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Bending stiffness-considered numerical computation method for stay cable forces

A bending stiffness, numerical calculation technology, applied in tension measurement, measuring devices, instruments, etc., can solve the problem of incomplete calculation results, and achieve the effect of improving accuracy and precision

Active Publication Date: 2012-10-17
FUZHOU UNIV
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Problems solved by technology

However, due to the assumptions and approximations in the approximation and fitting of the analytical formula, and the applied equation of motion of the stay cable fails to consider the bending stiffness and sag effect at the same time, the calculation results are not completely accurate

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  • Bending stiffness-considered numerical computation method for stay cable forces
  • Bending stiffness-considered numerical computation method for stay cable forces
  • Bending stiffness-considered numerical computation method for stay cable forces

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Embodiment Construction

[0012] The present invention considers the cable force numerical calculation method of the stay cable of bending stiffness, such as image 3 shown, including the following steps:

[0013] Step 1: Measure the vibration of the stay cable, and perform frequency spectrum analysis on the measured acceleration time history records to obtain the measured first-order frequency and the measured higher-order frequency of the stay cable vibration; according to the characteristic value of the stay cable itself, combined with The calculation formula of string vibration tension in the prior art calculates and obtains the estimated cable force value.

[0014] Step 2: Substituting the cable’s own characteristic value and estimated cable force value into the in-plane motion equation of the cable in consideration of bending stiffness, and using the numerical method of finite difference to solve it, the calculated first-order frequency and Calculate higher order frequencies.

[0015] Step 3: C...

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Abstract

The invention relates to a bending stiffness-considered numerical computation method for stay cable forces, comprising the following steps of: 1, measuring the vibration of a stay cable to obtain the vibration frequency which are actually measured, and estimating the force of the stay cable to obtain the estimated force value; 2, putting the characteristic value of the stay cable and the estimated force value to an in-plane equation of motion of the stay cable based on the flexural rigidity, and utilizing a limited difference value method to solve, and then obtaining the vibration computing frequency of the stay cable; 3, computing the difference between the computing frequency and the really measured frequency of the vibration of the stay cable, if the difference is in the allowed error range, judging the estimated force value to be the actual force value of the stay cable and ending up the algorithm, if the difference is not in the allowed error range, adjusting the estimated force value, performing the loop iteration until that the difference between the computed frequency and the actual frequency is located in the allowed error range, and adopting the estimated force value after being adjusted as the actual force value. The method is in favor of improving the accuracy of the force measurement result of the stay cable.

Description

technical field [0001] The invention relates to the technical field of cable-stayed bridge design, in particular to a numerical calculation method for cable forces of cable-stayed cables in consideration of bending stiffness. Background technique [0002] The currently widely used cable force calculation method is to obtain a cable force calculation formula that can consider the bending stiffness and sag effect by approximating and fitting the cable motion equation, which is called the analytical formula method to solve the cable force. The advantage of the analytical formula method is that the calculation is simple, and the cable force value of the stay cable can be obtained without repeated iterations. However, due to the assumptions and approximations in the approximation and fitting of the analytical formula, and the applied cable motion equation fails to consider the bending stiffness and sag effect at the same time, the calculation results are not completely accurate. ...

Claims

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Application Information

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IPC IPC(8): G01L5/04G01H17/00
Inventor 吴庆雄黄宛昆陈宝春
Owner FUZHOU UNIV
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